Moving the user SignUp feature from MyPortal to the Framework

Details

Description

Hi Devs!
In the attached patch I have reworked the feature that allows a new user to SignUp for an account.
This feature is actually only available when logging in at the MyPortal application.
Well, IMO it should be centrally available so that the login screen is exactly the same regardless of the application.
The Captcha feature is already implemented (captcha.java) partially in the framework and so this patch should be seen as a clean up also.

I added full internationalization of all labels and created some labels in the CommonUiLabels.xml file.

I would like some review so that I could then commit if nobody finds something wrong.

By the way, there is for sure some improvement that could be done at a later stage:

Eliminate the labels that have been created in the CommonUiLabels from Party and MyPortal

Add an encription of the Captcha code so that it will not be easily broken by robots.